Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d309a06ea5eb98…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 16:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0603bb949cdd5c6d15a06b481e57a02 SHA-1: 9d678b7f1717bd19f1a916d0366f21a37a7a7fff SHA-256: b2d309a06ea5eb980479ab90156ce74e3fa5d36dcee7b8876376ee0dd8d96106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://zajazd-broadway.pl/galeria/file/zobevijerasobebug.pdf In PDF document text
    • http://georgewongdesign.com/gwd/upload/files/lotatitezapireduje.pdfIn PDF document text
    • http://llux.vn/uploads/files/15401493041.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0dd4c21e5666646d75b8f936c562e20d/54669246457.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/vivemaxotapij.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/3891527152.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/lezadetibi.pdfIn PDF document text
    • http://simonide.org/userfiles/file/35969432015.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/96475781700.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210909113252.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/wawigofatoxojunidepepobaw.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/lejalanupimapigiborebib.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/663ba7f037ef04afbd4bb1e362df0249/besuxexalaweduxe.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/jatekubatoxanosilo.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/35370565258.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/5524690963.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163122918612.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/718ca5914e55d224da82334938411e57/mewuzu.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/zoguzotikaxaboxajaxedew.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/92414677145.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/91857642777.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/pawakamimep.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0656a6a2---kojovovuzawimufosixobir.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/vovazatotoxoduwifagu.pdfIn PDF document text
    • https://medtek.vn/storage/file/naxefiwaxedel.pdfIn PDF document text
    • http://koddous.com/userfiles/file/55994469963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=positive+words+that+start+with+letter+nPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 17212 bytes
SHA-256: 2f850fa0409ba0d7335abc0e8db7d0255ee5a275381cdf5138175297a79f8370
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 10500 bytes
SHA-256: 1df59aebb9927328ad194c3dc9051059ed8ff61d280813677ce02b3a2ecec066
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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